Evaluation on the expression efficiency of personalized labial appliances in non-extraction orthodontic treatment for mild crowding of teeth

doi:10.19439/j.sjos.2025.04.015

Abstract

Abstract: PURPOSE: To evaluate the expression efficiency of personalized labial appliances in patients with mild dental crowding. METHODS: Thirty-two Class Ⅰor Class Ⅱ malocclusion patients with mild crowding of anterior teeth were selected. All patients were treated with the Insignia personalized labial correction system without tooth extraction. The three-dimensional digital dental models before treatment, at the target position and after treatment were collected. Then, the widths and torques of the maxillary and mandibular dental arches were measured, and the expansion efficiency was calculated. RESULTS: After orthodontic treatment, the widths of the maxillary and mandibular dental arches were significantly increased compared with those before treatment (P<0.05), but there was no significant difference compared with the widths of the target dental arches (P>0.05). Among the maxillary teeth positions, except for the first premolar, the actual expansion amounts of the other teeth positions were significantly less than the target expansion amounts (P<0.05); among the mandibular teeth positions, except for the first molar, there was no significant difference between the actual expansion amounts and the target expansion amounts of the other teeth positions (P>0.05). In the maxilla, the expansion efficiency was the highest for the first premolars and the lowest for the first molars; while in the mandible, it was the highest for the second premolars and the lowest for the first molars. Except for the mandibular first molars, there were statistically significant differences in the torques between pre-treatment and the target torques as well as between pre-treatment and post-treatment at most tooth positions in the maxilla and mandible (P<0.05). Except for the maxillary second premolars, there was no significant difference in the torques between pre-treatment and the target torques at the other tooth positions (P>0.05). CONCLUSIONS: The application of Insignia personalized labial aligners in the treatment of mild anterior tooth crowding cases with relatively good lateral profile can effectively widen the dental arch and achieve a correction result close to the target position. However, the long-term effect still needs further research.

Key words: Customized, Labial appliance, Torque, Dental arch width, Angle ClassⅠmalocclusion, Angle Class Ⅱ malocclusion

CLC Number:

R783.5

Mao Xiaoyan, Huang Le, Yang Jiayin, Jiang Wei, Li Lingyu, Chen Xiping. Evaluation on the expression efficiency of personalized labial appliances in non-extraction orthodontic treatment for mild crowding of teeth[J]. Shanghai Journal of Stomatology, 2025, 34(4): 427-432.

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